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Do you think humans have a moral obligation to preserve the habitat of the chimpanzee

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.

How do light years astronomers to determine the ages of distant objects in space ?